Centrifugal pump trouble shooting
Views: 3 Author: Site Editor Publish Time: 2016-01-07 Origin: Site
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| Defects | Causes | Solutions | | Pump not primed, both the hands of vacuum gauge and manometer switches violently | Not enough water filled in the pump
Air leakage in the pipe or meters | Filled with water again
Fix the leakage | | Pump not primed and high degree vacuum indicated on the vacuum gauge | Foot valve not open or clogged
Suction resistance too high or suction lift too high | Check or replace the foot valve
Clean or replace the inlet pipe
Reduce the suction lift | | No water discharged while outlet pressure is pointed by the manometer | Wrong direction of rotation
Impeller clogged | Check or shorten the pipe
Check the motor rotation
Remove the pipe joint and clean the impeller | | Lower capacity than specified value | Pump clogged
Wear ring worn out | Clean pump and pipes
Replace the wear ring | | Too much power consumed by pump | Packing too tight
Stuffing box too hot
Impeller worn out
Too large flow that the pump is working in. | Loosen gland packing
Replace impeller
Turn down discharge valve to reduce flow | Abnormal noise inside the pump
Pump not primed
| Flow too large
Resistance too high in the inlet pipe
Suction lift too high
Air leakage into the inlet pipe
Liquid temperature too high | Turn down discharge valve
Reduce flow
Fix leakage
Lower liquid temperature | | Bearings over-heart | Short of lubricant or lubricant too dirty
Pump shaft not in alignment to that of the motor
Bearing worn out | Filled with clean oil or grease
Align coupling centerline
Replace bearing | | Vibration | Pump shaft not in alignment to that of the motor | Align coupling centerline
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